ISO INTERNATIONAL STANDARD 23168 First edition 2019-04 Paints and varnishes Determination of water content Gas- chromatographic method Peintures et vernisDétermination de la teneur en eau-Méthode par chromatographie en phase gazeuse Reference number IS0 23168:2019(E) so @ IS0 2019 IS0 23168:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 23168:2019(E) Contents Page Foreword ..iv 1 Scope .1 2 Normativereferences ..1 3 Terms and definitions ..1 4 Principle 5 Apparatus 2 5.1 Gas chromatograph .2 5.2 Sample injection system .2 5.3 Oven.. 2 5.4 Detector 2 5.5 Capillary column 2 5.6 Injection syringe 2 5.7 Data processing 2 5.8 Samplevials 2 5.9 Gasfilter 2 5.10 Carriergas 3 5.11 Analytical balance. 3 5.12 Bottie-top dispenser. .3 6 Reagents and materials .3 6.1 Internal standard (anhydrous) .3 6.2 Dilution solvent 3 6.3 Water .3 6.4 Molecular sieve. .3 7 Sampling. ..3 8 Procedure. ..4 8.1 Gas-chromatographic conditions ..4 8.2 Water content of the dilution solvent .4 8.3 Calibration .4 8.4 Sample preparation 4 8.5 Quantitative determination of water content ..5 9 Expression of results .6 10 Precision ..6 10.1 General .6 10.2 Repeatability limit, r 10.3 Reproducibility limit, R ..6 11 Test report .7 Annex A (informative) Example of gas-chromatographic conditions. .8 Annex B (informative) Information about precision .9 Bibliography .11 @ IS0 2019 - All rights reserved iii